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during a process described by the photoelectric effect, ultraviolet light can be used to charge a piece of metal.
(a) if such light is incident on a slab of conducting material and electrons are ejected with enough energy that they escape the surface of the metal how long before the metal has a net charge of + 1.50 nC if 1.00 X 10^6 electrons are ejected per second?
(b) if 1.3eV is needed to eject an electron from the surface what is the power rating of the light beam? (assume this process is 100% efficient).
find the net force acting on a 2.50 c charge placed at the origin from 3 equal charges of -1.25c placed at the
A roof-top solar water heater collects 50% of the 200 W/m^2 provided by the sun, using absorbers with a total area of 30m^2. If water enters the system at 15(C), how many hours will be required to warm 150kg of water to 60(C) using this heater? (Y..
Consider three identical metal spheres, A, B, and C. Sphere A carries a charge of -2q. Sphere B carries a charge of +5q. Sphere C carries no net charge. Spheres A and B are touched together and then separated. Sphere C is then touched to sphere A and..
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A pitcher claims he can throw a 0.160-kg baseball with as much momentum as a 2.50-g bullet moving with a speed of 1.50 103 m/s
The drawing shows three situations in which a block is attached toa spring. The position labeled “0 m” represents theunstrained position of the spring. The block is moved from aninitial position x0 to a final positionxf, the magnitude of the displa..
Two bumper cars moving on a frictionless surface collide elastically. What is the speed of the first bumper car after the collision
A motorist drives south at 27.0 m/s for 3.90 min, then turns west and travels at 25.0 m/s for 2.40 min, and finally travels northwest at 40.0 m/s for 1.00 min. For this 6.40 min trip, find the values.
a ray of light moving along the vector -i-2j undergoes refraction at an interface of two media which is the x-z
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